[RE-wrenches] Voltage Degradation with Uni-Solar laminate

[Ray Walters]

http://www.sciencedaily.com/releases/2014/02/140213122404.htm
http://www.nrel.gov/docs/fy12osti/51664.pdf
go to the conclusion on page 18.

Thanks,

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 6/1/2015 5:46 PM, jay peltz wrote:
> HI Ray,
>
> Can you tell me/us where you have your data on the a-Si having higher 
> voltage degradation over time?
>
> thanks
> jay
>
>
>
> On Sun, May 31, 2015 at 11:31 AM, Ray Walters <ray at solarray.com 
> <mailto:ray at solarray.com>> wrote:
>
>     Yes, amorphous modules degrade faster then crystalline cells. 15
>     years will really start catching up with you, that's why we always
>     tried to stick to monocrystalline when we could.
>     I think your best option for now is to rewire the array for much
>     higher voltage.  Even your current voltage problem aside, the
>     system will run more efficiently at higher voltage:  Less current
>     = less voltage drop.  I would probably just jump the 4 module sets
>     in series in the combiner box to 8 in series.  Should be a quick
>     fix, and really show an improvement.  I've seen this same issue
>     with low voltage polys and undersized wiring. Usually the MPP
>     controllers like some room to play with; as soon as the MPP
>     voltage gets close to or less than battery voltage, the current
>     drops off substantially.
>
>
>
>
>     R.Ray Walters
>     CTO, Solarray, Inc
>     Nabcep Certified PV Installer,
>     Licensed Master Electrician
>     Solar Design Engineer
>     303 505-8760  <tel:303%20505-8760>
>
>
> Jay Peltz
> Peltz Power
> jay.peltz at gmail.com <mailto:jay.peltz at gmail.com>
>
>
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